Cisco 1700 Series Installation Guide download pdf (Page 17)

Configuring an ADSL WAN Interface Card on Cisco 1700 Series Routers

OL-3317-03

Configuring Quality of Service Parameters

This section discusses quality of service (QoS) parameters that can be configured for the 1700 series

platforms when using the ADSL WIC. The following features are included:

• Low Latency Queuing (Priority Queuing with Class-Based Weighted Fair Queuing)

• DiffServ

• Committed Access Rate

• Multilink PPP over ATM with Link Fragmentation and Interleaving

• Weighted Random Early Detection

• ATM per-VC Queuing and VC Bundling

• ATM Cell Loss Priority Bit Marking

• Compressed RTP

• Tunable Transmission Ring

• MLP Bundling

Low Latency Queuing (Priority Queuing with Class-Based Weighted Fair

Queuing)

Low latency queuing (LLQ) allows strict priority queuing (PQ) to class-based weighted fair queuing

(CBWFQ). This priority queuing allows delay-sensitive data such as voice packets to be de-queued and

sent before other packet traffic, reducing jitter in voice conversations. To configure LLQ, enter the

priority command under the CBWFQ configuration.

Configuration Example

The following example shows a Cisco 1751 router configured with LLQ.

hostname zorro

username ruby-1 password 7 36497A4872384A

class-map match-all VOIP

match ip dscp 32

class-map CRITICAL

match access-group 100

policy-map 1751_ADSL

class CRITICAL

priority 48

class VOIP

bandwidth 64

set ip precedence 6

interface Loopback1

ip address 10.0.0.10 255.255.255.252

interface ATM0/0

dsl operating-mode auto

no ip address

no atm ilmi-keepalive

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Cisco 1700 Series Installation Guide Page 17